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module

xfrm-ESP Page-Cache Write via CVE-2026-43284

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Disclosed
May 8, 2026
Created
May 21, 2026

Description

CVE-2026-43284 is a Linux kernel page-cache write vulnerability in the IPsec/xfrm
subsystem affecting ESP (Encapsulating Security Payload) fragmentation. Dubbed
"DirtyFrag", the bug allows a local unprivileged user to gain write access to read-only
page-cache pages by triggering a race condition in how the kernel handles shared fragments
when processing ESP-encapsulated UDP packets. The exploit overwrites a SUID binary on disk
to execute an arbitrary payload as root.

Authors

Hyunwoo Kim
Giovanni Heward

Platform

Linux,Unix

Architectures

cmd

References

Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':


    msf > use exploit/linux/local/cve_2026_43284_dirty_frag
    msf exploit(cve_2026_43284_dirty_frag) > show targets
        ...targets...
    msf exploit(cve_2026_43284_dirty_frag) > set TARGET < target-id >
    msf exploit(cve_2026_43284_dirty_frag) > show options
        ...show and set options...
    msf exploit(cve_2026_43284_dirty_frag) > exploit
Title
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